Comparison of mesiodistal root angulation between panoramic radiography and reconstructed panoramic images from cone beam computed tomography
10.3760/cma.j.issn.1002-0098.2014.01.004
- VernacularTitle:锥形束CT曲面重建片与曲面体层X线片牙根近远中倾斜角度的比较
- Author:
Siqi LIU
1
;
Fujia WEN
;
Hua CHEN
;
Yi LIU
Author Information
1. 100034,北京大学口腔医学院·口腔医院第一门诊部
- Keywords:
Cone-beam computed comography;
Radiography,panoramic;
Inclination angle
- From:
Chinese Journal of Stomatology
2014;49(1):9-14
- CountryChina
- Language:Chinese
-
Abstract:
Objective To evaluate the difference of mesiodistal root angulation between panoramic radiograph and panoramic images reconstructed from cone beam computed tomography (CBCT) by different methods.Methods CBCT and panoramic radiograph of twenty patients were collected.The InvivoDental 5.0 was separately applied for maxillary or mandibular panoramic image reconstruction.The reconstruction method was combined by two head positions,the Frankfort plane horizontal position (P1) and the occlusal plane horizontal position (P2),and three central planes of focal trough (root apical plane,tooth center plane and crown marginal plane referring to the central incisor).Variation of tooth morphology in reconstructed panoramic images and panoramic radiograph was firstly observed.And then measurement for maxillary or mandibular anterior tooth intersection angle (contiguous angles among (321|123) were named as UA1-UA5 ;and those among (321 |123) were named as LA1-LA5) was taken.The difference of intersection angles between reconstructed panoramic images and panoramic radiograph (△UA and △LA) were calculated.Wilcoxon Rank Sum Test was finally applied to compare the intersection angles' differencesbetween P1 and P2 with the same central plane of focal trough.Results Panoramic images reconstructedfrom CBCT by tooth center plane with P1 for maxilla and P2 for mandible appeared to fulfill the clinicallydiagnostic demand through the observation.Among the 15 couples of comparison of intersection angles'differences between P1 and P2 by choosing the same central plane of focal trough for maxilla,7 couples of△UA revealed a statistically smaller value in P1 while 1 couple of △UA showed an adverse result.Inmandible with the same comparison method,10 couples of comparison did not show statistical differencebetween P1 and P2,while 4 couples of △LA revealed a statistically smaller value in P2 and 1 couple △LAshowed an opposite result.Conclusions By choosing the tooth center plane,the panoramic imagesreconstructed from CBCT with the Frankfort plane horizontal position in maxilla and the occlusal planehorizontal position in mandible were equally effective.The reconstructed panoramic images can be used as thepanoramic radiograph in the assessment of the mesiodistal root angulation.
